I have not seen the drama yet, but looking at the plot and how it's about revenge, I do think that king of pigs is similar to The Glory. They are both about middle age main lead who, unable to forget their past, decide to follow the path of vengeance by any means. They infiltrate their bullies lives so that they also can know what it's like to live in hell.

They both have the split personality trope and the main character are funny and cocky characters.

Hope you enjoy it as much as I did. The second season was also very good. It may have been a long time a go, but the show is still one of my favorite.